Effects of groove depth and patterned permalloy film on magnetization switching of LPE-garnet pixels for use in magneto-optic spatial light modulators

Park, J. H.; Nishmura, K.; Inoue, M.; Lee, D. H.; Cho, J. K.

doi:10.1063/1.1448797

Cited by 25 publications

(7 citation statements)

References 4 publications

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“…We have proposed a new variety of magnetooptical spatial light modulator (MO-SLM) driven by STS for high-resolution and high-speed applications, such as holographic memories and 3-D TV systems. Conventional MO-SLM devices are high-speed light modulators that use magnetostriction and which have their optical polarization rotated in accordance with the magnetization direction of the pixel element [4]. Using visible light, we observed the fundamental STS properties due to the magnetooptical Kerr effect in a single pixel element [5].…”

Section: Introductionmentioning

confidence: 94%

Multilevel Transitions of Closely Arranged Spin Valve Pillars Using Spin Transfer Switching

et al. 2008

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Two closely arranged spin valve pillars sharing a pair of top and bottom electrodes were fabricated and their spin transfer switching (STS) characteristics were investigated. Each pillar was a 300 100-nm rectangle, such that the distance between two pillars was varied up to 1 m. The STS curves of a single pillar and closely arranged pillars with the distance of 1 m showed single-step transitions, but the STS curves of closely arranged pillars with the distance of 0.3 m showed clear two-step transitions. We found that the plateau width of the intermediate resistive state of the two-step transitions can be controlled by the distance > . The basis for this stable intermediate resistive state seemed to be magnetic interactions and the intrinsic switching mode of STS.Index Terms-Magnetooptical Kerr effect, spin transfer switching, spin valve.

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Section: Introductionmentioning

confidence: 94%

Multilevel Transitions of Closely Arranged Spin Valve Pillars Using Spin Transfer Switching

et al. 2008

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“…However, higher resolution pixels are not easy to achieve because the magnetic field tend to diverge and may switch the unintended magnetic pixels next to the intended pixel [6]. The MOSLM driven by the electrostrictive effect has been developed for lower power consumption, however it may not be able to provide a higher resolution because it needs a complex structure of electrode [7]. Therefore, the viewing-zone angles of reconstructed images using these MOSLMs were very narrow because the pixel pitches of them were not small enough.…”

Section: Introductionmentioning

confidence: 99%

Holographic images reconstructed from GMR-based fringe pattern

Kato¹,

Aoshima²,

Machida³

et al. 2013

EPJ Web of Conferences

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Abstract.We have developed a magneto-optical spatial light modulator (MOSLM) using giant magneto-resistance (GMR) structures for realizing a holographic three-dimensional (3D) display. For practical applications, reconstructed image of hologram consisting of GMR structures should be investigated in order to study the feasibility of the MOSLM. In this study, we fabricated a hologram with GMR based fringe-pattern and demonstrated a reconstructed image. A fringe-pattern convolving a crossshaped image was calculated by a conventional binary computer generated hologram (CGH) technique. The CGH-pattern has 2,048 × 2,048 with 5 !m pixel pitch. The GMR stack consists of a Tb-Fe-Co/CoFe pinned layer, a Ag spacer, a Gd-Fe free layer for light modulation, and a Ru capping layer, was deposited by dc-magnetron sputtering. The GMR hologram was formed using photo-lithography and Krion milling processes, followed by the deposition of a Tb-Fe-Co reference layer with large coercivity and the same Kerr-rotation angle compared to the free layer, and a lift-off process. The reconstructed image of the ON-state was clearly observed and successfully distinguished from the OFF-state by switching the magnetization direction of the free-layer with an external magnetic field. These results indicate the possibility of realizing a holographic 3D display by the MOSLM using the GMR structures.

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“…The first such MOSLM was the magneto-optic-photoconductor sandwich developed by Krumme et al [4][5][6], which was made of an epitaxial (Gd,Bi) 3 (Fe,Ga) 5 O 12 film and a Cu-doped CdS photoconductor film. For MOSLMs made of bismuth-substituted yttrium iron garnet (Bi:YIG) films, switching pixels is demonstrated at the speed of several GHz [7][8][9]. However, application of Bi:YIG films for the transmission MOSLMs is limited, since they have large absorption in the short wavelength range.…”

Section: Introductionmentioning

confidence: 99%